Projection apparatus.



W. L. PATTERSON.

PROJECTION APPARATUS.

APPLICATION FiLED $29121. 1914.

1,21 8,1 1 3. Patented Mar. 6, 1917.

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PROJECTION APPARATU S-. APPLICATION FILED sEPTQ21. 1914.

1,218, 1 1 3. Patented Mar. 6, 1917.

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PROJECTION APPARATUS. APPLICATlON FILED SEPT.2I. 1914'.

Patented Mar. 6, 1917.

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WILLIAM L. I?ATTERSON OF ROCHESTER. NEW YORK. ASSIGNOR T0 BAU'SCH & LOMBOPTICAL COMlANY, OF ROCHESTER, NEW YORK, A CORPORATION OF NEW YORK.

PROJECTION APPARATUS.

Specification of Letters Patent.

i Patented Mar. 6, 1917.

ence n-mnerals nmrked thereon.

The present invention relates to projection apparatus of the type whichcontemplates the projectirm of images from opaque or transparent objectsin diti'erent planes or positions, employing a plurality of relativelyadjustable casings for changing the direction of the ray of light inaccordance with r the position the object to be projected. and

it has for its object to afford a construction that will effectivelyexclude exterior light from the interior of the casing in the differentpositions of adjustment. also is designed with a view to aii'ording anarrangement having other advantages as well as certain novel details ofconstruction.

-To theseand other ends'thc invention consists in certain improvementsand combinations of parts, all as will he hereinafter more fullydescril' ed, the novel features being pointed out in the claims at the athe specification.

In the drawings v Figure 1 is a side elevation of an apparatusconstructed in accordance with the invention- Fig. 2 is a longitudinalsectional view of the same.

Fig. 3 is a transverse sectional view on the Fig. 4 is a plan view.

Fig. 5 is a bottom plan view. Fig. 6 is an end elevation of'the frame,and

Fig. 7 is a sectional view on the line 77 oi Fig. 4.

Similar reference characters throughout theseveral views indicate thesame parts.

In the present emhodimcntof the apparatus there is employed a base frameA that is formed of sheet metal, the top portion of the frame beingpreferably constructed in the manner shown in Fig. 7, of two metalsheets or plates which are located in spaced relation to each other andhave overlapping portions designated at a that are suitably Theinvention.

secured together to form the sides. 'Tho frame also includes supports orlegs liwhich a 1 attached to the ends of the top portion.

Suitably supported upon the frame A, is a stationary casing l adapted toreceive the object. the image of which is to be projected, the objectbeing supported in visible relation to the stationary casing. The casingis open at the bottom and is supported upon the lower wall a of the topportionof the Frame A. For the projection oi opaque. objects. the wall ois provided with an opening adjacent to which the object is to be supported. and for this purpose I employ an object holder whiclris mountedon a substantially U-shaped wire support I. the arms oi which arepivotally arranged on thetrame. The object holder is held in itsnrirnialjposn tion as shown in Fig. 2 bymeans of springs II which areconnected to the frame and to the arms of the U-shapcd support.

E designates a projector for recciving the image from the object on theobject holder 1). while E .is a mirror or reflector for transferring theimage to a screen, Fis a projector for receiving the image, from atransparent object on the slide. F which may be positioned in the slidecarrier F The ray of light may he directed into either of the projectorsjust mentioned through the medium oi -an adjustable casing that isarranged to be moved with relation, to the stationary casing so as toilluminate either the opaque or the transparent objectand 1 will nowdescribe the construction and arrangement of the adjustable casing andits relation to the stationary casing whereby oxterior light is excludedfrom the interior oi" the latter. I i

The adjustable casing is designated at (i. being pivotally mounted onthe. arms y and arranged to swing from the position shown in Fig. l tothat appearing in Fig. 2 whereby to direct amay of light eitherdownwardly onto the opaque. object holder or horizontally to the.transparent. object holder. f/ and y/ are. condensing lenses arranged inthe adjustable casing. through which the ray of light is directed froman illuminator which preferably. embodies a pair oi carbon electrodes y"and The illuminator is mounted ona frame which is adjustable on guideso. in order to effect longitudinal adjustment of the illuvminator fromthe front of the machine. l

llf)

ne ted to the frame 5/ and extends through a slot 1/ in the casing G.being provided at its outer end with a handle portion y. By manipulatingthe. handle portion which is conveniently disposed at the front ot' thecasing within easy reach of the operator. the illnminator may be moveduntil it is in the desired position with relation to the condenser. l1.designates a handle on the adjustable casing for raising it to itselevated position while It is a spring actuated loelting member thatcooperates with an abutment It on the casing for holding the latterelevated in the manner shown in Fig. :2.

It is highly important that the connection between the stationary andthe adjustable casings e such as to prevent the admission of light fromthe outsidtzto the interior of the casings. To this end I provide thecasings with rigid cooperating walls that contact in such a manner as toform a close, light excluding engagement between the casings for eitheroperative position. may be accomplished in other ways than that which Iam about to describe. but I prefer to attain the result by cutting awaythe stationary casing upon a diagonal line as shown at It: forming anupper edge I."

against which the upper portion 1. of the adjustable casing contactswhen the latter is elevated. At its lower part. the stationary casing isprovided with the upstanding wall It, and Ir is a hood surroumling thecondenser and extending beyond the side wall of the adjusting casinprovided with a flange. Zr which engages within the wall In when theadjustable casing is elevated as shown in Fig. 2. \Vhen the adjustablecasing is lowered. the uppermost wall of the hood .r engages the undersurface /r of the upper wall of the stationary casing. With thisarrangement, there is no possibility of admitting any substantial amountof exterior light to the interior of the casing. in

either of the operative positions of the ad justable casing, and at thesame time the parts can be readily operated and adjusted and areconstructed in an extremely simple manner.

The machine which I have described atfords a very neat and compactarrangement that can be economically mannl'aetured. and possesses therequisite degree of strength in its various parts while at the same timea ffording a novel arrangement that is characterized b marked advantagesin the operation ol the apparatus.

1 claim as my invention:

l. in a projection :tj' j'):ll'tllll$. the-combination with a l'rame andstationary casing. of means for supporting an object in visible relationto the stationary casing. an adjustable casing provided with acondenser. and

This

BEST AVAILABLE cos an illnminator for the adjustable casing. the adjustale casing being provided with rigid walls that engage the stationarycasing closel in any operative position to exclude exterior light.

in a projection apparatus, the combination with a frame and a stati narycasing. ol' means for supporting an object in isi le relation to thestationary casing. an adjustable casing. an illnminator for -theadjustable casin and rigid means mounted on one of the casings andserving to connect the casings closely in any operative position toexclude exterior light.

3. In a projection apparatus. the combination with a frame and astationary casing,

of means for supportingan object in visible.-

relation to the stationary casing. an adjustable casing. an illnminatorfor the adjustable casing and a condenser arranged in the adjustablecasing. a hood surrounding and extending beyond the condenser. and rigidwalls on the stationary casing against which "said hood and the:nljustable casing engage to exclude exterior light in any operative.

position.

4. In a projection apparatus. the combination with a i'ran and a casinghaving an opening in one wall thereof. of a. U-shaped support having itsarms pivoted on the frame, an object holder mounted on the sup--' portand normally located adjacent said opening, and springs connecting thesupport and the frame.

5. A frame for projection apparatus consisting of a top portion havingupper and lower sheet metal plates arranged in spaced relation to eachother and overlapping to" forntside walls. ol a casing. an object holdermounted in visible relation to the casing. a projector. and anilhuninator cooperating with the casing.

(i. frame for projection apparatus. consisting of a top portion havingupper aml lower sheet metal plates arranged in spayed relation to eachother. and overlapping to form side walls. of a casing. a proje tor. andan illnminator cooperating with the casing.

7. In a projection apparatus. the combination with a f ame andstationanr casing. an adjustable casing. an illnminator for theadjustable casin and rigid light ex lllding walls on the adjustableasing having engagementwith igid light excluding walls on the stationaryca ne in "either of the operative posit-ions ol adju tment. and servingto exclude light from within the 1 ing.

